A spokesperson for Racing Point said there was no information other than the FIA comment.
“Checo is not on the circuit today due to an inconclusive test result,” he said.
“He’s self-isolating while waiting for the results of a new test. “
All paddock staff must be tested for COVID-19 at least every five days, as stated by the FIA in its protocols for the grand prix this season.
Racing Point is expected to bring in one of Mercedes’ reserve drivers for the race weekend if Perez tests positive for COVID-19, as part of a deal with the team.
It is likely that Esteban Gutierrez would have to make his first F1 start since his last appearance for Haas at the end of the 2016 season if Perez were left out.
Gutierrez shares the Mercedes reserve role with former McLaren F1 driver Stoffel Vandoorne, who has more recent Grand Prix experience, making his most recent start at the 2018 Abu Dhabi Grand Prix.
But Vandoorne is unlikely to be on hand at Silverstone this weekend as he prepares for the final six races of the Formula E season in Berlin, which will take place over a nine-day period starting next Wednesday.
A second test for Perez is part of FIA protocols when screening all paddock staff for COVID-19, but this is the first time it has been made public that a driver must take a retest.
F1 has reported the results of more than 15,000 COVID-19 tests to date, only two of which have been confirmed as positive.
Both events were recorded in Hungary two weeks ago, and neither was in Austria for the first two rounds.